What All Is Needed To Convert To Disc Brakes On A 2021 Grand Design Momentum With 7,000 Pound Axles?

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Question:

Hi. I purchased a 2021 Grand Design Momentum 5th Wheel Toy Hauler last year and have been enjoying it immensely. However, I don't like the electric brakes. So I want to get it converted over to a disc brake system. I have the Tekonsha P3 brake controller so I know it can handle this type of set up, but what all do I need and which kit will fit my toy hauler? It has 7,000 pound axles and 8 lug wheels on it. I am looking at the HydraStar kit that has the terminal box and break away kit as well. Is this a good option? The reviews seem to be pretty good for it. Thanks in advance.

asked by: Chad

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Expert Reply:

If you are wanting to upgrade to disc brakes on your 2021 Grand Design Momentum 5th Wheel Toy Hauler, you are definitely in luck. We actually have an install video of the Kodiak Disc Brake Kit # K2HR712E being installed on a 2020 Momentum and is the one I recommend going with. These have an E-coat finish that provides good corrosion resistance and can actually be used for freshwater and limited saltwater use, though I don't recommend submerging your toy hauler. This kit will also match your 8 on 6-1/2 bolt pattern, so no need to change your wheels out. It does not includes bearings, seals, or caps though, so I have them listed below.

Replacement Trailer Hub Bearing # 14125A
Replacement Trailer Hub Bearing # 25580
Grease Seal - Double Lip # GS-2250DL
Grease Cap, 2.44" OD Drive In with Plug - Qty 2 # RG04-080

You will also need some brake lines. For a tandem axle, you will need the # HS496-252.

I was actually going to recommend the HydraStar # HS381-9067 kit before I saw that you were looking at it. I like that it comes with the break away kit and junction/terminal box to make things easier, but I have also found the HydraStar actuators to be the best we currently carry. You are also correct in that your Tekonsha Prodigy P3 # 90195 brake controller will have absolutely no problem getting this set up working properly.

Just as a side note, you will need one brake kit per axle. You will also need two of each bearing, two seals, and one grease cap set per axle as well.

expert reply by: Lazer S

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Answer 1

On a brake rotor with E-coat or any finish you do not have to do anything to remove the coating. Trying to remove it could result in damage to the rotor and affect braking performance. So all you would have to do is install the brakes, bleed the…

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Answer 2

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 3

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 4

Trailer wheel bearings are specific to the spindle that is installed on the axle that is on your trailer. You will need to safely support the trailer, remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secures the…

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Answer 5

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 6

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 7

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part #AKIHUB-440-2-1K for an idler hub. A BTR spindle would have…

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Answer 8

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 9

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 10

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 11

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 12

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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What All Is Needed To Convert To Disc Brakes On A 2021 Grand Design Momentum With 7,000 Pound Axles?

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